Wenn jemand von meinen Schnitzelbäumen gegessen hätte, wäre ich auch wütend :D
You've made good use of the limited palette, and the colour scheme is very bright and peppy. The sprites look good too, and I could imagine the style working quite well if it was a little more animated.
This is a good base for an arena shooter, I think. Reminds me of something I would've played on Newgrounds bakin the day. You could consider building on that - including more types of enemies, perhaps some powerups, that sort of thing. The controls feel good.
A note about Godot: You seem to have included your whole project in the download. You just need the executable files (.exe/.x86_64) plus the .pck file, that one already contains all the assets. Godot packs these up for you when you export your game.